Use doxygen comments in all headerfiles

[sjors]

At this moment, the header files for all classes contain documentation like this:

    // this method prints foo
    void       printFoo();

Doxygen ignores comments like that, instead, we should write this:

    //! this method prints foo
    void       printFoo();

So we should run a s_//_//!_ on our headerfiles as one of the first things we do for kmess 2.1. This will probably also highlight a lot of classes with missing documentation... :)

[sjors]

argh, I fail at filling in forms when tired